On Fri 06 Jan 2017 at 11:11:45 (+1100), Keith Bainbridge wrote: > Ummm, why turn the monitor off first?
Perhaps because Davide doesn't want to wait 30 mins¹ before closing the lid and finding out if the problem still recurs. > I use suspend rather than hibernate, on a macbook 4,1 and just close the > lid. I get a password screen as soon as I open up. So would that be using more power both when the lid is closed, and also when the lid is left open for prolonged periods? ¹ I used to specify 10/20/30 minutes for stand-by/suspend/off when I ran real CRT monitors. > On 6 Jan 2017 08:04, "solitone" <solit...@mail.com> wrote: > > > I'm on debian stretch, and my computer is a MacBookPro 12,1. I've recently > > noticed an issue that affect my system when it hibernates. > > > > When the screen is already switched off and then the system hibernates, it > > won't resume correctly later on. Specifically, the monitor will be > > switched off > > again at the end of the resume process. > > > > E.g. I give the following command in order to switch off the monitor: > > > > $ sleep 1 && xset dpms force off > > > > then I close the lid so that my system hibernates. Then I resume the > > system. > > The monitors turns on, as I see the boot loader screen and some boot > > messages. > > But then, when the resume is complete, the screen is switched off again, > > and > > there is no way to turn it on. The only solution is press the power button > > to > > turn off the entire computer. > > > > I get the same issue even when, instead of using the xset command, I wait > > several minutes so that the screen is switched off automatically by KDE's > > power management, and then I hibernate the system. > > > > By contrast, I have no issue if I hibernate when the screen is still on. > > The > > resume works perfectly well. Besides, suspend (to RAM) has no issue either, > > both when the screen is on and when it is off. > > > > I've already reported a bug to the mainteiners of debian kernel. But in the > > meanwhile, as a workaround I'm thinking of using a systemd script that > > forces > > the monitor on just before the system starts hibernating. I've tried with > > "xset dpms force on", however it won't in fact turn on the monitor. Is > > there a > > way to do this? Do you perhaps need xset -display <something> dpms force on in the systemd script? Cheers, David.
